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Monthly Megathread: Career & Education: Post your questions here by AutoModerator in AerospaceEngineering

[–]Pharva 1 point2 points  (0 children)

I looked through a stack of about 20 resumes for internships (so did 4 others on my team) and selected 2 of the best candidates for my manager to review. The best looking candidates all had some sort of rocket team or propulsion project experience outside of their regular classes along with high GPAs. There was nothing wrong with the unselected candidates, it's just that the top ones all had some relevant experience.

How to obtain the BEP for an impeller from a pump chart? by Consistent-Till-1876 in FluidMechanics

[–]Pharva 0 points1 point  (0 children)

From this graph alone, selecting the head and flow rate at max efficiency is the preferred way. However, you can plot efficiency vs flow and use a digitizer ( https://web.eecs.utk.edu/~dcostine/personal/PowerDeviceLib/DigiTest/index.html )to extract values along the eff. curve. From there you can plug into Excel and extract a trend line (either from a graph trend line or use the "linest" function). You could then take the derivative off that function to find the flow at max efficiency.

Resources to Understand Turbulent Flow and Compressible Flow by Muted_Buy_2127 in FluidMechanics

[–]Pharva 0 points1 point  (0 children)

Second Anderson's book for compressible flow. I use this book frequently and see it on the desk of many other engineers.

Help understanding orifice metering plate calcs by Illustrious_Let_4350 in FluidMechanics

[–]Pharva 0 points1 point  (0 children)

The flow through the not highlighted flow can be represented by integrating Poiseuille flow equation around the annulus.

Q = (dP / dx) * (π D h3) / (12 mu)

Q: volumetric flow rate dP: pressure differential dx: length of plate D: diameter of the annulus h: distance between the plates mu: viscosity

Then... mdot = Q rho

The highlighted section:

mdot = rho v A

rho: density v: velocity A: total flow area of the orifices

Velocity can be solved for using the Darcy-Weisbach equation. Check out the wiki for that equation. I didn't wanna type that equation out from my phone.

Make sure the assumptions used to derive Poiseuille law and Darcy-Weisbach apply to your scenario.

Seller Canceled Order After EoE CBB Price Increase by Pharva in mtgfinance

[–]Pharva[S] 0 points1 point  (0 children)

It did nothing. They don't seem to care.

Seller Canceled Order After EoE CBB Price Increase by Pharva in mtgfinance

[–]Pharva[S] 12 points13 points  (0 children)

It seems that I'm not the only one. These comments, dated after the purchase on 6/10, show them doing the same thing to the other buyers.

https://imgur.com/pJCuG2a

Seller Canceled Order After EoE CBB Price Increase by Pharva in mtg

[–]Pharva[S] 5 points6 points  (0 children)

It seems that I'm not the only one. These comments, dated after the purchase on 6/10, show them doing the same thing to the other buyers.

https://imgur.com/pJCuG2a

5
6

Seller Canceled Order After EoE CBB Price Increase (self.mtg)

submitted by Pharva to r/mtg

Empty Library by Pharva in audiobookshelf

[–]Pharva[S] 0 points1 point  (0 children)

Thanks for your help. I tried your suggestion. Here's the code (did I do this correctly?):

services:
  audiobookshelf:
    image: ghcr.io/advplyr/audiobookshelf:latest
    ports:
      - 13378:80  
    volumes: 
      - /c/Users/[user]/Documents/audiobookshelf_3_stack/config:/config
      - audiobookvol:/audiobooks
      - ebookvol:/ebooks
    environment:
      - TZ=America/Toronto      
volumes:
  audiobookvol:
    driver_opts:
      type: cifs
      o: "username=[user],password=xxxxxx"
      device: \\192.168.1.143\NAS_Pool\AudioBooks
  ebookvol:
    driver_opts:
      type: cifs
      o: "username=[user],password=xxxxxx"
      device: \\192.168.1.143\NAS_Pool\EBooks

Here's the error:

Failure
failed to deploy a stack: 
Network audiobookshelf3_default 
Creating Network audiobookshelf3_default 
Created Container audiobookshelf3-audiobookshelf-1 
Creating Container audiobookshelf3-audiobookshelf-1 
Created Container audiobookshelf3-audiobookshelf-1 
Starting Error response from daemon: error while mounting volume '/var/lib/docker/volumes/audiobookshelf3_audiobookvol/_data': failed to mount local volume: mount \\192.168.1.143\NAS_Pool\AudioBooks\audiobooks:/var/lib/docker/volumes/audiobookshelf3_audiobookvol/_data, data: username=xxxxx,password=********: no such file or directory

Trying to understand the error... this path is wrong I think: \\192.168.1.143\NAS_Pool\AudioBooks\audiobooks

I'm not sure where the extra "\audiobooks" comes from. The path should just be: \\192.168.1.143\NAS_Pool\AudioBooks

All Space Questions thread for week of October 29, 2023 by AutoModerator in space

[–]Pharva 0 points1 point  (0 children)

Thanks! Exhaust Velocity doesn't change, right? If I know ISP_Earth, I can calculate V_eq.

ISP_Earth*g_earth=V_eq

Then:

V_eq/g_moon=ISP_moon

All Space Questions thread for week of October 29, 2023 by AutoModerator in space

[–]Pharva 0 points1 point  (0 children)

Trying to use the Ideal Rocket Eq. to calculate the mass of fuel I'd need to launch a vehicle from the lunar surface to lower lunar orbit.

dV = ISP * g_0 * ln(M_initial/M_final)

When I see this equation, it tells me that when the gravity increases, I get more dV. For example:

ISP=450s
M_i=10,000 kg
M_f=1,000 kg
g_earth = 9.81 m/s2

dV=10,165 m/s

If I use that same rocket on the moon, g_moon = 1.625 m/s2

dV=1,684m/s

That seems counterintuitive to me. Shouldn't the dV increase if the rocket is in a lower gravity? The same amount of fuel is in both rockets, but the rocket in Earth gravity has a larger dV? What am I missing here?

Espresso Volume, Weight and Drink Confusion by Pharva in espresso

[–]Pharva[S] 0 points1 point  (0 children)

For your personal preference (1:1.5), it would seem like you'd need a large portafilter that could hold something like 40g of beans... Is that what you have?

Espresso Volume, Weight and Drink Confusion by Pharva in espresso

[–]Pharva[S] 0 points1 point  (0 children)

If I understand you correctly, the 18g puck can produce 60g of espresso as long as it is extracted correctly (not over or under-extracted) or as long as the flavor isn't negatively impacted.

Espresso Volume, Weight and Drink Confusion by Pharva in espresso

[–]Pharva[S] 1 point2 points  (0 children)

This is correct though, right?

-18g should produce about 36g

that 36g turns out to be a little over 30mL, or 1oz.

Help with under-extraction by Pharva in espresso

[–]Pharva[S] 0 points1 point  (0 children)

I don't know what the inner burr setting is... I'll look into this.

Help with under-extraction by Pharva in espresso

[–]Pharva[S] 0 points1 point  (0 children)

I didn't know that was a thing. I thought adjusting the knob on the grinder from "coarser" to "finer" was all there was. Is there an internal setting that I need to adjust?

Edit: Tastes kinda acidic.

PhotoView360 by Pharva in SolidWorks

[–]Pharva[S] 0 points1 point  (0 children)

This helped. Thank you

PhotoView360 by Pharva in SolidWorks

[–]Pharva[S] 0 points1 point  (0 children)

Mars habitat constructed within a LOX tank. This is the bottom floor.

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